TPS62360_1108 Datasheet, PDF (21/52 Pages) Texas Instruments – 3A Processor Supply with I2C Compatible Interface and Remote Sense

TPS62360, TPS62361B, TPS62362
www.ti.com
SLVSAU9A – MAY 2011 – REVISED AUGUST 2011
DETAILED DESCRIPTION
The TPS6236x are a family of high-frequency synchronous step down dc-dc converter optimized for
battery-powered portable applications. With an input voltage range of 2.5V to 5.5V, common battery technologies
are supported.
The device provides up to 3A peak load current, operating at 2.5MHz typical switching frequency.
The devices convert to an output voltage range of 0.77V to 1.4V (TPS62360 / TPS62362) and 0.5V to 1.77V
(TPS62361B), programmable via I²C interface in 10mV steps.
The TPS6236x supports low-voltage DSPs and processor cores in smart-phones and handheld computers,
including latest submicron processes and their retention modes and addresses digital voltage scaling
technologies such as SmartReflex™.
Output Voltages and Modes can be fully programmed via I²C. To address different performance operating points
and/or startup conditions, the device offers four output voltage / mode presets which can be chosen via
dedicated hardware input pins allowing simple and zero latency output voltage transition.
The devices focus on a high output voltage accuracy. The fully differential sensing and the DCS-Control™
architecture achieve precise static and dynamic, transient output voltage regulation. This accounts for stable
processor operation. Output voltage security margins can be kept small, resulting in an increased overall system
efficiency.
The TPS6236x devices offer high efficiency step down conversion. The area of highest efficiency is extended
towards low output currents to increase the efficiency while the processor is operating in retention mode, as well
as towards highest output currents reducing the power loss. This addresses the power profile of processors. High
efficiency conversion is required for low output currents to support the retention modes of processors, resulting in
an increased battery on-time. To address the processor maximum performance operating points with highest
output currents, high efficiency conversion is enabled as well to save the battery on-time and reduce input power.
The robust architecture and multiple safety features allow perfect system integration.
The 2mm x 2mm package and the low number of required external components lead to a tiny solution size of
approximately 27.5 mm².
OPERATION
The TPS6236x synchronous switched mode power converters are based on DCS-Control™, an advanced
regulation topology, that combines the advantages of hysteretic, voltage mode and current mode control
architectures.
While a comparator stage provides excellent load transient response, an additional voltage loop ensures high DC
accuracy as well. The TPS6236x compensates ground shifts at the load by the differentially sensing the output
voltage at the point of load.
The internal ramp generator adds information about the load current and fast output voltage changes. The
internally compensated regulation network achieves fast and stable operation with low ESR capacitors.
The DCS-Control™ topology supports PWM (Pulse Width Modulation) mode for medium and heavy load
conditions and a Power Save Mode at light loads. During PWM it operates at its nominal switching frequency in
continuous conduction mode. This frequency is typically about 2.5MHz with a controlled frequency variation
depending on the input voltage. As the load current decreases, the converter enters Power Save Mode to sustain
high efficiency down to light loads. The transition from PWM to Power Save Mode is seamless and avoids output
voltage transients.
An internal current limit supports nominal output currents of up to 3A. The TPS6236x family offers both excellent
DC voltage and superior load transient regulation, combined with very low output voltage ripple, minimizing
interference with RF circuits.
ENABLING AND DISABLING THE DEVICE
The device is enabled by setting the EN input to a logic high. Accordingly, a logic low disables the device. If the
device is enabled, the internal power stage will start switching and regulate the output voltage to the programmed
threshold. The EN input must be terminated unless the internal pull down resistor is activated.
Copyright © 2011, Texas Instruments Incorporated
Submit Documentation Feedback
21
Product Folder Link(s): TPS62360 TPS62361B TPS62362